He was in the episode "Evil Ice Cream Man Much?" Alexandra went to the "Out Of This World" dance with him at the end of the episode.
For some reason Samantha seemed to dislike him as she described him as "perfect, wonderful Barry," with an annoyed look on her face at Clover's hyper reaction at Alex being his date.
Looking for Alex inside the store
Confused at not finding her inside where he'd just seen her